Sexy Supermodel Battle: Kate Upton Vs. Bar Refaeli

Kate Upton and Bar Refaeli are two of the hottest supermodels around right now, thanks to tons of exposure from both Sports Illustrated and Maxim magazine.

Upton, the voluptuous American who covered SI's annual Swimsuit Issue in February, has had no qualms about flaunting her assets for numerous print and TV ads; including hamburger chain Carl's Jr. (watch it here), apparel company Zoo York (watch here), and DirecTV (here).

She's also done numerous racy magazine shoots for the likes of GQ (one here and one here), Esquire (here), and Contributor (here).